h2 {
  text-align: center;
}
.people_list {
  width: 400px;
  margin: 100px auto;
  padding: 20px;
  border: 1px solid #eee;
}
.people_list li {
  height: 50px;
  line-height: 50px;
}
.form_input {
  width: 320px;
  height: 30px;
}
.people_list button {
  width: 100px;
  height: 30px;
  margin-left: 150px;
  margin-top: 150px;
}
